{"product_id":"eminence-sigma-pro-18a-2-18-cast-frame-speaker-driver","title":"Eminence Sigma Pro 18A-2 18\" Cast Frame Speaker Driver","description":"\u003cp\u003e18\" Woofer for Vented Enclosures in Professional Audio Applications\u003c\/p\u003e \u003cp\u003eThe Eminence Sigma Pro-18A-2 18\" cast frame speaker is recommended for professional audio as a woofer or subwoofer in vented enclosures. It has been engineered for durability as well as exceptional sound quality, and will serve well when loaded into high-output live sound or music playback systems. Made in the USA. 7-year manufacturer's warranty!\u003c\/p\u003e\u003ch2\u003eFeatures:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eNominal Basket Diameter: 18\"\u003c\/li\u003e\n\u003cli\u003eNominal Impedance: 8 ohms\u003c\/li\u003e\n\u003cli\u003ePower Rating: 650W (1300W, Music Program)\u003c\/li\u003e\n\u003cli\u003eResonance: 28Hz\u003c\/li\u003e\n\u003cli\u003eUsable Frequency Range: 41Hz-2.4kHz\u003c\/li\u003e\n\u003cli\u003eSensitivity: 99dB\u003c\/li\u003e\n\u003cli\u003eMagnet Weight: 120 oz.\u003c\/li\u003e\n\u003cli\u003eGap Height: 0.37\"\u003c\/li\u003e\n\u003cli\u003eVoice Coil Diameter: 3\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSPECIFICATION\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eNominal Basket Diameter: 18\"\u003c\/li\u003e\n\u003cli\u003ePower Handling (RMS): 650 Watts\u003c\/li\u003e\n\u003cli\u003ePower Handling (max): 1300 Watts\u003c\/li\u003e\n\u003cli\u003eImpedance: 8 ohms\u003c\/li\u003e\n\u003cli\u003eFrequency Response: 41 to 2,400 Hz\u003c\/li\u003e\n\u003cli\u003eSensitivity: 99 dB 1W\/1m\u003c\/li\u003e\n\u003cli\u003eVoice Coil Diameter: 3\"\u003c\/li\u003e\n\u003cli\u003eMagnet Weight: 120 oz.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eThiele-Small Parameters\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eResonant Frequency (Fs): 28 Hz\u003c\/li\u003e\n\u003cli\u003eDC Resistance (Re): 6.29 ohms\u003c\/li\u003e\n\u003cli\u003eVoice Coil Inductance (Le): 1.90 mH\u003c\/li\u003e\n\u003cli\u003eMechanical Q (Qms): 8.28\u003c\/li\u003e\n\u003cli\u003eElectromagnetic Q (Qes): 0.30\u003c\/li\u003e\n\u003cli\u003eTotal Q (Qts): 0.29\u003c\/li\u003e\n\u003cli\u003eCompliance Equivalent Volume (Vas): 15.58 ft.³\u003c\/li\u003e\n\u003cli\u003eMechanical Compliance of Suspension (Cms): 0.24 mm\/N\u003c\/li\u003e\n\u003cli\u003eBL Product (BL): 22.1 Tm\u003c\/li\u003e\n\u003cli\u003eDiaphragm Mass Inc. Airload (Mms): 130g\u003c\/li\u003e\n\u003cli\u003eMaximum Linear Excursion (Xmax): 6.1 mm\u003c\/li\u003e\n\u003cli\u003eSurface Area of Cone (Sd): 1,140 cm²\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMaterials of Construction\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eCone Material: Paper\u003c\/li\u003e\n\u003cli\u003eSurround Material: Cloth\u003c\/li\u003e\n\u003cli\u003eVoice Coil Wire Material: Copper\u003c\/li\u003e\n\u003cli\u003eVoice Coil Former: Kapton \/ Polyimide\u003c\/li\u003e\n\u003cli\u003eBasket \/ Frame Material: Cast Aluminum\u003c\/li\u003e\n\u003cli\u003eMagnet Material: Ferrite\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMounting Information\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eOverall Outside Diameter: 18\"\u003c\/li\u003e\n\u003cli\u003eBaffle Cutout Diameter: 16.56\"\u003c\/li\u003e\n\u003cli\u003eDepth: 8.15\"\u003c\/li\u003e\n\u003cli\u003e# Mounting Holes: 8\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOptimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eSealed Volume: 1.87 ft.³\u003c\/li\u003e\n\u003cli\u003eSealed F3: 83 Hz\u003c\/li\u003e\n\u003cli\u003eVented Volume: 4.33 ft.³\u003c\/li\u003e\n\u003cli\u003eVented F3: 53 Hz\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Eminence","offers":[{"title":"Default Title","offer_id":42497737949362,"sku":"EMN SIGMAPRO18A2","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0614\/8122\/2322\/products\/sigma-pro-18a-2-01.jpg?v=1665767262","url":"https:\/\/www.performanceaudio.com\/products\/eminence-sigma-pro-18a-2-18-cast-frame-speaker-driver","provider":"Performance Audio","version":"1.0","type":"link"}